Oracle使用fy_recover_data恢复truncate删除的数据

(一)truncate操作概述

在生产中，truncate是使用较多的命令，在使用不当的情况下，往往会造成表的数据全部丢失，恢复较为困难。对于truncate恢复，常见的有以下几种方法可以进行恢复：

使用数据泵导入。该方法操作简单，前提是必须要有备份可用，并且会有数据的丢失；
使用RMAN进行不完全恢复。可将数据库恢复到truncate之前的时刻，但是恢复时间较长；
使用odu、prm-dul、GDUL等收费软件进行恢复；
使用fy_recover_data包；

使用RMAN进行异机恢复已在之前测试过，详见：https://www.cnblogs.com/lijiaman/p/11577001.html 。

（二）FY_Recover_Data介绍

FY_Recover_Data是国内Oracle ACE大佬黄玮（个人网站：http://www.hellodba.com）开发的一个package，该脚本专门用于对truncate的表进行恢复。

根据作者所述，其原理：如果我们已经有一套元数据及数据块，然后将被TRUNCATE的用户数据块的内容取代其用户数据块的内容，是否可以“骗”过Oracle，让它读出这些数据呢？

回顾一下表扫描的过程，这个方法应该是可行的。我们只要想办法构造出一个结构相同、且具有完整元数据信息和格式化了的用户数据块的傀儡表对象，然后将被TRUNCATE的用户数据块找出，再将其数据内容部分嫁接到傀儡对象的用户数据块，使Oracle以外这是傀儡对象的数据，就能让Oracle扫描并读出数据内容。其原理用图示描述如下：

                                                +-------------------------+

                                                | Copy Of Dummy Data File |

                                                |  (With Formmated Blocks)|

                                                +-------------------------+

                                                            ||

                                                            \/

                                                (Blcok Header, Block Tail)

                                                            ||

                                                            \/

+-------------------+                                +----------------+     Table Scan    +---------------+

| Source Data File  | => (Data Block Content) =>     |  Dummy Table   |    ============>  | Restore Table |

|(Without Meta Data)|                                |(With Meta Data)|                   +---------------+

+-------------------+                                +----------------+

FY_Recover_Data对于表恢复的支持性如下：

压缩表	支持
索引组织表	支持
分区表	支持
行链接/行迁移	不支持
标准SQL类型	支持
BLOB/CLOB	支持Store in Row
离线恢复	支持
操作系统平台	全部
数据库版本	9i以上

本文使用FY_Recover_Data对truncate的几种情况进行恢复测试，以验证fy_recover_data的恢复能力。

(三)操作过程记录

（3.1）使用fy_recover_data包执行truncate恢复，truncate后未有新数据进入表

STEP1：创建测试表，并执行truncate

SQL> create table test01 as select * from dba_objects;

SQL> select count(*) from test01;

  COUNT(*)

----------

     86968

SQL>

SQL> truncate table test01;

Table truncated

SQL> select count(*) from test01;

  COUNT(*)

----------

         0

STEP2：导入FY_Recover_Data.pck包

[oracle@source-node ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Tue Apr 21 10:50:17 2020

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> @/home/oracle/FY_Recover_Data.pck          -- 第一次执行发现第30行存在“&”符号，删除该符号

Enter value for files:

old  30:   -- 1. Temp Restore and Recover tablespace & files      ---

new  30:   -- 1. Temp Restore and Recover tablespace       ---

Package created.

Warning: Package Body created with compilation errors.

SQL> @/home/oracle/FY_Recover_Data.pck      -- 删除“&”符号后导入成功

Package created.

Package body created.

STEP3：开始执行恢复，只需要两个参数：schema和table_name

[oracle@source-node ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Tue Apr 21 11:11:20 2020

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> set time on

11:11:43 SQL> set serveroutput on

11:11:54 SQL> exec fy_recover_data.recover_truncated_table('LIJIAMAN','TEST01');

11:12:01: Use existing Directory Name: FY_DATA_DIR

11:12:02: Recover Table: LIJIAMAN.TEST01$

11:12:02: Restore Table: LIJIAMAN.TEST01$$

11:12:09: Copy file of Recover Tablespace: FY_REC_DATA_COPY.DAT1

11:12:09: begin to recover table LIJIAMAN.TEST01

11:12:09: Use existing Directory Name: TMP_HF_DIR

11:12:09: Recovering data in datafile

/u01/app/oracle/oradata/testdb1/users01.dbf

11:12:09: Use existing Directory Name: TMP_HF_DIR

11:12:39: 1242 truncated data blocks found.

11:12:39: 86968 records recovered in backup table LIJIAMAN.TEST01$$

11:12:39: Total: 1242 truncated data blocks found.

11:12:39: Total: 86968 records recovered in backup table LIJIAMAN.TEST01$$

11:12:39: Recovery completed.

11:12:39: Data has been recovered to LIJIAMAN.TEST01$$

PL/SQL procedure successfully completed.

STEP4：根据恢复日志，会创建临时中转表test01$和test01$$，恢复的数据保存在test01$$中

SQL> show user

User is "LIJIAMAN"

SQL> select count(*) from test01$$;

  COUNT(*)

----------

     86968

--将数据还原到test01表中

SQL> insert into test01 select * from test01$$;

--确认数据已经还原回来

SQL> select count(*) from test01;

  COUNT(*)

----------

     86968

经过测试，如果表被truncate后，未执行其它操作，数据可以使用fy_recover_data恢复回来。

#######################################################################################

（3.2）使用fy_recover_data包执行truncate恢复，truncate后有新数据进入表（新插入的数据比truncate之前多）

STEP1：创建测试表、序列、存储过程

SQL> create table test01

  2  (

  3      col1      number,

  4      col2      number,

  5      col3      date,

  6      col4      varchar2(30),

  7      col5      varchar2(100)

  8  );

Table created

SQL> --创建自增序列

SQL> CREATE SEQUENCE seq01

  2    START WITH 1

  3    MAXVALUE 99999999

  4    MINVALUE 0

  5    CYCLE

  6    CACHE 10

  7    ORDER;

Sequence created

SQL> --创建随机数据插入存储过程,其中col1列单调递增

create or replace procedure p_insert_test01 IS

v_col1 NUMBER;

BEGIN

FOR i IN 1..10000 LOOP

select seq01.nextval INTO v_col1 from dual;

insert into test01(col1,col2,col3,col4,col5)

values

(v_col1,

(select round(dbms_random.value(10000, 100000000)) from dual),

sysdate,

(select dbms_random.string('a', 25) from dual),

(select dbms_random.string('a', 85) from dual));

END LOOP;

commit;

end p_insert_test01;

STEP2：测试表插入10000条数据，col1列的值从1到10000

SQL> exec p_insert_test01;

PL/SQL procedure successfully completed

SQL> select count(*) from test01;

  COUNT(*)

----------

     10000

SQL> SELECT MIN(col1),MAX(col1) FROM test01;

MIN(COL1)  MAX(COL1)

---------- ----------

         1      10000

STEP3：执行truncate操作

SQL> truncate table test01;

Table truncated

STEP4：接着往表里插入20000条数据

SQL> exec p_insert_test01;

PL/SQL procedure successfully completed

SQL> exec p_insert_test01;

PL/SQL procedure successfully completed

SQL> select count(*) from test01;

  COUNT(*)

----------

     20000

SQL> SELECT MIN(col1),MAX(col1) FROM test01;

MIN(COL1)  MAX(COL1)

---------- ----------

     10001      30000

STEP5：执行恢复操作

[oracle@source-node ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Tue Apr 21 14:00:57 2020

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> set serveroutput on

SQL> set time on

14:01:06 SQL>

14:01:09 SQL> exec fy_recover_data.recover_truncated_table('LIJIAMAN','TEST01');

14:01:13: Use existing Directory Name: FY_DATA_DIR

14:01:13: Recover Table: LIJIAMAN.TEST01$

14:01:14: Restore Table: LIJIAMAN.TEST01$$

14:01:18: Copy file of Recover Tablespace: FY_REC_DATA_COPY.DAT1

14:01:18: begin to recover table LIJIAMAN.TEST01

14:01:18: Use existing Directory Name: TMP_HF_DIR

14:01:18: Recovering data in datafile

/u01/app/oracle/oradata/testdb1/users01.dbf

14:01:18: Use existing Directory Name: TMP_HF_DIR

14:01:32: 402 truncated data blocks found.

14:01:32: 20000 records recovered in backup table LIJIAMAN.TEST01$$

14:01:32: Total: 402 truncated data blocks found.

14:01:32: Total: 20000 records recovered in backup table LIJIAMAN.TEST01$$

14:01:32: Recovery completed.

14:01:32: Data has been recovered to LIJIAMAN.TEST01$$

PL/SQL procedure successfully completed.

STEP6：通过对test01$$表进行确认，发现返回的数据是truncate之后插入的数据，不符合要求

SQL> select count(*) from test01;

  COUNT(*)

----------

     20000

SQL> select count(*) from test01$$;

  COUNT(*)

----------

     20000

SQL> SELECT MIN(col1),MAX(col1) FROM test01;

MIN(COL1)  MAX(COL1)

---------- ----------

     10001      30000

SQL> SELECT MIN(col1),MAX(col1) FROM test01$$;

MIN(COL1)  MAX(COL1)

---------- ----------

     10001      30000

#######################################################################################

（3.3）使用fy_recover_data包执行truncate恢复，truncate后有新数据进入表（新插入的数据比truncate之前少）

STEP1：创建测试表、序列、存储过程

Connected to Oracle Database 11g Enterprise Edition Release 11.2.0.4.0

Connected as lijiaman@192.168.10.11/testdb1

SQL> DROP TABLE  test01 PURGE;

Table dropped

SQL> create table test01

  2  (

  3  col1 number,

  4  col2 number,

  5  col3 date,

  6  col4 varchar2(30),

  7  col5 varchar2(100)

  8  );

Table created

SQL> DROP SEQUENCE seq01;

Sequence dropped

SQL> --创建自增序列

SQL> CREATE SEQUENCE seq01

  2  START WITH 1

  3  MAXVALUE 99999999

  4  MINVALUE 0

  5  CYCLE

  6  CACHE 10

  7  ORDER;

Sequence created

SQL> --创建随机数据插入存储过程,其中col1列单调递增

SQL> create or replace procedure p_insert_test01 IS

  2  v_col1 NUMBER;

  3  BEGIN

  4  FOR i IN 1..10000 LOOP

  5  select seq01.nextval INTO v_col1 from dual;

  6  insert into test01(col1,col2,col3,col4,col5)

  7  values

  8  (v_col1,

  9  (select round(dbms_random.value(10000, 100000000)) from dual),

 10  sysdate,

 11  (select dbms_random.string('a', 25) from dual),

 12  (select dbms_random.string('a', 85) from dual));

 13  END LOOP;

 14  commit;

 15  end p_insert_test01;

16  /

Procedure created

STEP2：测试表插入10000条数据，col1列的值从1到10000

SQL> exec p_insert_test01;

PL/SQL procedure successfully completed

SQL> select count(*) from test01;

  COUNT(*)

----------

     10000

SQL> SELECT MIN(col1),MAX(col1) FROM test01;

MIN(COL1)  MAX(COL1)

---------- ----------

         1      10000

STEP3：执行truncate操作

SQL> truncate table test01;

Table truncated

STEP4：修改存储过程，酶促插入100条数据

SQL> --创建随机数据插入存储过程,其中col1列单调递增

SQL> create or replace procedure p_insert_test01 IS

  2  v_col1 NUMBER;

  3  BEGIN

  4  FOR i IN 1..100 LOOP

  5  select seq01.nextval INTO v_col1 from dual;

  6  insert into test01(col1,col2,col3,col4,col5)

  7  values

  8  (v_col1,

  9  (select round(dbms_random.value(10000, 100000000)) from dual),

10  sysdate,

11  (select dbms_random.string('a', 25) from dual),

12  (select dbms_random.string('a', 85) from dual));

 13  END LOOP;

 14  commit;

 15  end p_insert_test01;

 16  /

Procedure created

-- 测试表插入100条数据

SQL> exec p_insert_test01;

PL/SQL procedure successfully completed

STEP5：执行恢复操作

[oracle@source-node ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Tue Apr 21 14:22:34 2020

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> set time on

14:22:39 SQL> set serveroutput on

14:22:44 SQL> exec fy_recover_data.recover_truncated_table('LIJIAMAN','TEST01');

14:22:52: Use existing Directory Name: FY_DATA_DIR

14:22:52: Recover Table: LIJIAMAN.TEST01$

14:22:52: Restore Table: LIJIAMAN.TEST01$$

14:22:57: Copy file of Recover Tablespace: FY_REC_DATA_COPY.DAT1

14:22:57: begin to recover table LIJIAMAN.TEST01

14:22:57: Use existing Directory Name: TMP_HF_DIR

14:22:57: Recovering data in datafile

/u01/app/oracle/oradata/testdb1/users01.dbf

14:22:57: Use existing Directory Name: TMP_HF_DIR

14:23:06: 5 truncated data blocks found.

14:23:06: 100 records recovered in backup table LIJIAMAN.TEST01$$

14:23:06: Total: 5 truncated data blocks found.

14:23:06: Total: 100 records recovered in backup table LIJIAMAN.TEST01$$

14:23:06: Recovery completed.

14:23:06: Data has been recovered to LIJIAMAN.TEST01$$

PL/SQL procedure successfully completed.

STEP6：通过对test01$$表进行确认，发现返回的数据是truncate之后插入的数据，不符合要求

SQL> select count(*) from test01; COUNT(*)
----------
100 SQL> SELECT MIN(col1),MAX(col1) FROM test01; MIN(COL1) MAX(COL1)
---------- ----------
10001 10100 SQL>
SQL> select count(*) from test01$$; COUNT(*)
----------
100 SQL> SELECT MIN(col1),MAX(col1) FROM test01$$; MIN(COL1) MAX(COL1)
---------- ----------
10001 10100

#######################################################################################
（3.4）测试数据文件被覆盖是否影响恢复

STEP1：创建测试表

Connected to Oracle Database 11g Enterprise Edition Release 11.2.0.4.0

Connected as lijiaman@192.168.10.11/testdb1

SQL> create table test01

  2  (

  3  col1 number,

  4  col2 number,

  5  col3 date,

  6  col4 varchar2(30),

  7  col5 varchar2(100)

  8  ) TABLESPACE USERS;

Table created

STEP2：初始时候，表空间总共20MB，剩余15.94MB

SQL> SELECT  SUBSTR(a.TABLESPACE_NAME,1,30) TablespaceName,

  2      round(SUM(a.bytes/1024/1024),2)  AS "Totle_size(MB)",

  3      round(SUM(NVL(b.free_space1/1024/1024,0)),2) AS "Free_space(MB)",

  4      round(SUM(a.bytes/1024/1024),2)-round(SUM(NVL(b.free_space1/1024/1024,0)),2)  AS "Used_space(MB)",

  5      ROUND((SUM(a.bytes/1024/1024)-SUM(NVL(b.free_space1/1024/1024,0))) *100/SUM(a.bytes/1024/1024),2) AS "Used_percent%",

  6      round(SUM((case when a.MAXBYTES = 0 then a.bytes else a.MAXBYTES end)/1024/1024),2)                AS "Max_size(MB)",

  7      ROUND((SUM(a.bytes/1024/1024)-SUM(NVL(b.free_space1/1024/1024,0)))*100/SUM((case when a.MAXBYTES = 0 then a.bytes else a.MAXBYTES end)/1024/1024),2) AS "Max_percent%"

  8    FROM dba_data_files a,

  9      (SELECT SUM(NVL(bytes,0)) free_space1,

 10        file_id

 11      FROM dba_free_space

 12    GROUP BY file_id

 13     ) b

 14  WHERE a.file_id = b.file_id(+)

 15  AND   a.TABLESPACE_NAME = 'USERS'

 16   GROUP BY a.TABLESPACE_NAME;

TABLESPACENAME                                                                   Totle_size(MB) Free_space(MB) Used_space(MB) Used_percent% Max_size(MB) Max_percent%

-------------------------------------------------------------------------------- -------------- -------------- -------------- ------------- ------------ ------------

USERS                                                                                        20          15.94           4.06         20.31           20        20.31

STEP3：test01表插入大量数据

SQL> exec p_insert_test01;

PL/SQL procedure successfully completed

SQL> /

PL/SQL procedure successfully completed

SQL> /

PL/SQL procedure successfully completed

SQL> /

PL/SQL procedure successfully completed

SQL> /

PL/SQL procedure successfully completed

SQL> /

PL/SQL procedure successfully completed

SQL> /

PL/SQL procedure successfully completed

SQL> /

PL/SQL procedure successfully completed

SQL> /

PL/SQL procedure successfully completed

SQL> /

begin p_insert_test01; end;

ORA-01653: unable to extend table LIJIAMAN.TEST01 by 128 in tablespace USERS

ORA-06512: at "LIJIAMAN.P_INSERT_TEST01", line 6

ORA-06512: at line 1

STEP4：此时，表空间总共20MB，剩余0.94MB

SQL> SELECT  SUBSTR(a.TABLESPACE_NAME,1,30) TablespaceName,

  2      round(SUM(a.bytes/1024/1024),2)  AS "Totle_size(MB)",

  3      round(SUM(NVL(b.free_space1/1024/1024,0)),2) AS "Free_space(MB)",

  4      round(SUM(a.bytes/1024/1024),2)-round(SUM(NVL(b.free_space1/1024/1024,0)),2)  AS "Used_space(MB)",

  5      ROUND((SUM(a.bytes/1024/1024)-SUM(NVL(b.free_space1/1024/1024,0))) *100/SUM(a.bytes/1024/1024),2) AS "Used_percent%",

  6      round(SUM((case when a.MAXBYTES = 0 then a.bytes else a.MAXBYTES end)/1024/1024),2)                AS "Max_size(MB)",

  7      ROUND((SUM(a.bytes/1024/1024)-SUM(NVL(b.free_space1/1024/1024,0)))*100/SUM((case when a.MAXBYTES = 0 then a.bytes else a.MAXBYTES end)/1024/1024),2) AS "Max_percent%"

  8    FROM dba_data_files a,

  9      (SELECT SUM(NVL(bytes,0)) free_space1,

 10        file_id

 11      FROM dba_free_space

 12    GROUP BY file_id

 13     ) b

 14  WHERE a.file_id = b.file_id(+)

 15  AND   a.TABLESPACE_NAME = 'USERS'

 16   GROUP BY a.TABLESPACE_NAME;

TABLESPACENAME                                                                   Totle_size(MB) Free_space(MB) Used_space(MB) Used_percent% Max_size(MB) Max_percent%

-------------------------------------------------------------------------------- -------------- -------------- -------------- ------------- ------------ ------------

USERS                                                                                        20           0.94          19.06         95.31           20        95.31

STEP5：此时test01表有90000行数据

SQL> select count(*) from test01;

  COUNT(*)

----------

     90000

SQL> SELECT MIN(col1),MAX(col1) FROM test01;

MIN(COL1)  MAX(COL1)

---------- ----------

    109751     199750

STEP6：对test01执行truncate

SQL> truncate table test01;

Table truncated

STEP7：执行truncate后，空间已经释放

SQL> SELECT  SUBSTR(a.TABLESPACE_NAME,1,30) TablespaceName,

  2      round(SUM(a.bytes/1024/1024),2)  AS "Totle_size(MB)",

  3      round(SUM(NVL(b.free_space1/1024/1024,0)),2) AS "Free_space(MB)",

  4      round(SUM(a.bytes/1024/1024),2)-round(SUM(NVL(b.free_space1/1024/1024,0)),2)  AS "Used_space(MB)",

  5      ROUND((SUM(a.bytes/1024/1024)-SUM(NVL(b.free_space1/1024/1024,0))) *100/SUM(a.bytes/1024/1024),2) AS "Used_percent%",

  6      round(SUM((case when a.MAXBYTES = 0 then a.bytes else a.MAXBYTES end)/1024/1024),2)                AS "Max_size(MB)",

  7      ROUND((SUM(a.bytes/1024/1024)-SUM(NVL(b.free_space1/1024/1024,0)))*100/SUM((case when a.MAXBYTES = 0 then a.bytes else a.MAXBYTES end)/1024/1024),2) AS "Max_percent%"

  8    FROM dba_data_files a,

  9      (SELECT SUM(NVL(bytes,0)) free_space1,

 10        file_id

 11      FROM dba_free_space

 12    GROUP BY file_id

 13     ) b

 14  WHERE a.file_id = b.file_id(+)

 15  AND   a.TABLESPACE_NAME = 'USERS'

 16   GROUP BY a.TABLESPACE_NAME;

TABLESPACENAME                                                                   Totle_size(MB) Free_space(MB) Used_space(MB) Used_percent% Max_size(MB) Max_percent%

-------------------------------------------------------------------------------- -------------- -------------- -------------- ------------- ------------ ------------

USERS                                                                                        20          15.88           4.12         20.63           20        20.63

STEP8：创建表test02，用来覆盖test01释放的空间

SQL> create table test02 as select * from dba_objects;

Table created

STEP9：test02表创建之后，剩余空间为5.88MB，可以说明：test02表的数据占用了test01表释放出来的空间，即test01表的部分数据已经被覆盖

SQL> SELECT  SUBSTR(a.TABLESPACE_NAME,1,30) TablespaceName,

  2      round(SUM(a.bytes/1024/1024),2)  AS "Totle_size(MB)",

  3      round(SUM(NVL(b.free_space1/1024/1024,0)),2) AS "Free_space(MB)",

  4      round(SUM(a.bytes/1024/1024),2)-round(SUM(NVL(b.free_space1/1024/1024,0)),2)  AS "Used_space(MB)",

  5      ROUND((SUM(a.bytes/1024/1024)-SUM(NVL(b.free_space1/1024/1024,0))) *100/SUM(a.bytes/1024/1024),2) AS "Used_percent%",

  6      round(SUM((case when a.MAXBYTES = 0 then a.bytes else a.MAXBYTES end)/1024/1024),2)                AS "Max_size(MB)",

  7      ROUND((SUM(a.bytes/1024/1024)-SUM(NVL(b.free_space1/1024/1024,0)))*100/SUM((case when a.MAXBYTES = 0 then a.bytes else a.MAXBYTES end)/1024/1024),2) AS "Max_percent%"

  8    FROM dba_data_files a,

  9      (SELECT SUM(NVL(bytes,0)) free_space1,

 10        file_id

 11      FROM dba_free_space

 12    GROUP BY file_id

 13     ) b

 14  WHERE a.file_id = b.file_id(+)

 15  AND   a.TABLESPACE_NAME = 'USERS'

 16   GROUP BY a.TABLESPACE_NAME;

TABLESPACENAME                                                                   Totle_size(MB) Free_space(MB) Used_space(MB) Used_percent% Max_size(MB) Max_percent%

-------------------------------------------------------------------------------- -------------- -------------- -------------- ------------- ------------ ------------

USERS                                                                                        20           5.88          14.12         70.63           20        70.63

STEP10：执行恢复操作

[oracle@source-node ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Tue Apr 21 15:09:58 2020

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> set time on

15:10:05 SQL> set serveroutput on

15:10:10 SQL> exec fy_recover_data.recover_truncated_table('LIJIAMAN','TEST01');

15:10:17: Use existing Directory Name: FY_DATA_DIR

15:10:17: Recover Table: LIJIAMAN.TEST01$

15:10:17: Restore Table: LIJIAMAN.TEST01$$

15:10:22: Copy file of Recover Tablespace: FY_REC_DATA_COPY.DAT1

15:10:22: begin to recover table LIJIAMAN.TEST01

15:10:22: Use existing Directory Name: TMP_HF_DIR

15:10:22: Recovering data in datafile

/u01/app/oracle/oradata/testdb1/users01.dbf

15:10:22: Use existing Directory Name: TMP_HF_DIR

15:10:31: 645 truncated data blocks found.

15:10:31: 24439 records recovered in backup table LIJIAMAN.TEST01$$

15:10:31: Total: 645 truncated data blocks found.

15:10:31: Total: 24439 records recovered in backup table LIJIAMAN.TEST01$$

15:10:31: Recovery completed.

15:10:31: Data has been recovered to LIJIAMAN.TEST01$$

PL/SQL procedure successfully completed.

STEP11：发现只恢复了部分数据，不符合要求

-- truncate之前test01表有90000行数据，恢复了24339行数据

SQL> select count(*) from test01$$;

  COUNT(*)

----------

     24439

SQL> SELECT MIN(col1),MAX(col1) FROM test01;

MIN(COL1)  MAX(COL1)

---------- ----------

SQL>

SQL> SELECT MIN(col1),MAX(col1) FROM test01$$;

MIN(COL1)  MAX(COL1)

---------- ----------

    109751     199750

(四)总结

对于使用工具fy_recover_data进行数据恢复，需要确保：

①truncate之后，需要保证没有新的数据进入表中，否则无法还原；

②存放该表的数据文件块不能被覆盖，否则无法完整还原数据。

在发生故障后，可以迅速使用：

SQL> alter tablespace users read only;

SQL> alter tablespace users read write;

来关闭/开启表空间的写功能，这样可以保证数据文件不会被覆写。

【完】

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